DIRECT DARK-MATTER SEARCH PROGRAM WITH BOLOMETERS AT THE UNIVERSITY-OF-TOKYO

Bolometers are being developed at the University of Tokyo aiming at a search for galactic dark matter. We have succeeded in constructing a s mall-sized bolometer with 2.8 gram of lithium fluoride crystal with an rms energy resolution of 3.8 keV for 60-keV gamma rays. Both lithium and fluorine are expected to be suitable for the detection of possible particle dark matter with a spin-dependent interaction like supersymm etric neutralinos. Fabrication of Neutron Transmutation Doped (NTD) ge rmanium is also in progress to make a number of thermistors with unifo rm sensitivities to be used for multi-module bolometers. When the deve lopment of a full-sized detector with a total mass of order one kilogr am is completed, we plan to install it in the Kamioka underground labo ratory.